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Microchip Technology 1N4748CP/TR8
- Part No.:
- 1N4748CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4748CP/TR8.pdf
- Description:
- DIODE ZENER 22V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,467
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Product details
Overview
1N4748CP/TR8 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal zener voltage 22 V, ±5% tolerance (A suffix), plastic DO-41 package, and RoHS-compliant e3 plating. It regulates voltage across wide current and temperature ranges (-65°C to +150°C) and is used in power supply reference, overvoltage protection, and voltage-clamping circuits.
For engineers reviewing the 1N4748CP/TR8 datasheet, 1N4748CP/TR8 pinout, 1N4748CP/TR8 application, or 1N4748CP/TR8 equivalent, key selection criteria include zener voltage (22 V), test current (11.5 mA), dynamic impedance (23 Ω at IZT), maximum regulator current (205 mA at TA = 50°C), and thermal resistance (105°C/W on FR4).
Technical Context
This device operates in reverse breakdown to maintain stable voltage under varying load and line conditions. Its 22 V zener voltage is specified at 11.5 mA test current with 23 Ω dynamic impedance, ensuring predictable regulation behavior near knee conduction.
Designed for through-hole mounting, it features cathode band polarity marking, tin-plated leads compliant with MIL-STD-750 Method 2026, and moisture sensitivity level 1 per J-STD-020B-no dry pack required prior to soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±5% at IZT = 11.5 mA - defines stable regulation point for reference and clamping |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - sets maximum continuous DC power handling |
| Dynamic Impedance (ZZT) | 23 Ω at IZT = 11.5 mA - determines output voltage variation under load current changes |
| Max Regulator Current (IZM) | 205 mA at TA = 50°C - limits safe operating current before thermal runaway |
| Thermal Resistance | 105°C/W junction-to-ambient on FR4 (1 oz Cu, 4 mm² pad) - governs temperature rise under load |
| Reverse Leakage (IR) | 5 μA max at VR = 16.7 V - ensures low standby power loss in high-impedance bias networks |
| Forward Voltage | 1.2 V max at IF = 200 mA - relevant for series protection or dual-direction clamp configurations |
Pinout & Package
Package: DO-41 (DO-204AL), axial-lead plastic molded case with void-free thermosetting epoxy (UL94V-0), cathode indicated by colored band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower potential node; forward conduction path when biased positively relative to cathode |
| Cathode | Banded end | Connected to higher potential node during Zener operation; defines regulation reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior enabling direct replacement in legacy designs |
| Plastic DO-41 construction (P suffix) | Lower thermal resistance vs. glass-body variants - improves power derating margin in compact layouts |
| RoHS-compliant "e3" termination | Matte-tin plating compatible with Pb-free reflow and wave soldering per JEDEC J-STD-020B |
| Moisture Sensitivity Level 1 | No dry-pack or baking required before assembly - reduces manufacturing overhead and floor-life constraints |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in production |
Applications
| Power Supply Reference | Voltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator circuits or providing precision bias for op-amp comparators. IC Role / Device Role / Timing Role: Zener reference element establishing fixed DC reference point independent of input ripple or load variation. Use Value: Delivers 22 V ±5% regulation with 23 Ω dynamic impedance, minimizing output drift across 1–200 mA operating range. | Use Scenario: Limiting transient overvoltage on microcontroller I/O lines or sensor inputs exposed to ESD or inductive kickback. IC Role / Device Role / Timing Role: Shunt clamping device that conducts above 22 V to divert surge energy away from sensitive downstream components. Use Value: Withstands 205 mA max regulator current and 750 mA surge current (½-sine, 1/120 s), protecting against common 1 kV ESD events. |
| DC-DC Converter Feedback | Industrial Sensor Excitation |
Use Scenario: Setting output voltage in isolated flyback or forward converter secondary-side feedback loops. IC Role / Device Role / Timing Role: Precision voltage reference connected to optocoupler input or TL431 control pin to close regulation loop. Use Value: Stable 22 V reference enables accurate output setpoint control within ±1% over -40°C to +85°C ambient. | Use Scenario: Providing stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in process control transmitters. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source supplying constant current via series resistor to sensor elements. Use Value: 23 Ω dynamic impedance and <5 μA leakage at 16.7 V ensure minimal loading error and high common-mode rejection in ratiometric measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | No TR8 tape-and-reel packaging; bulk or ammo pack only; same electrical specs and DO-41 package | Not suitable for automated pick-and-place; requires manual loading or vibratory bowl feed | Select 1N4748CP/TR8 for SMT-line-compatible reel delivery; choose 1N4748A for prototyping or low-volume hand assembly |
| MMBZ5248BS | SOT-23 surface-mount package; 22 V ±5%, 200 mW rating; 30 Ω ZZT; not drop-in replaceable | Used in space-constrained PCBs where axial leads are prohibited; unsuitable for >150 mA continuous loads | Choose MMBZ5248BS only when board area is critical and power demand stays below 150 mW; retain 1N4748CP/TR8 for full 1 W capability and thermal robustness |
Compared with 1N4748A and MMBZ5248BS, the 1N4748CP/TR8 uniquely combines JEDEC-standard DO-41 mechanical compatibility, full 1 W power rating, tape-and-reel automation support, and industrial-grade thermal performance - making it optimal for high-reliability through-hole power regulation where layout flexibility and supply chain continuity matter.
Availability
1N4748CP/TR8 is available at Aetrix Electronics and suitable for power supply reference, voltage clamp protection, and DC-DC converter feedback applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N4748CP/TR8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was developed to deliver standardized, JEDEC-registered Zener regulation with enhanced thermal performance and RoHS compliance - targeting industrial power supplies, instrumentation, and ruggedized embedded systems.
FAQ
What is the zener voltage tolerance of the 1N4748CP/TR8?
The 1N4748CP/TR8 has a nominal zener voltage of 22 V with ±5% tolerance, indicated by the "A" suffix in its part number per JEDEC standard. This tolerance applies at 11.5 mA test current and 25°C lead temperature. The "P" denotes plastic DO-41 package, and "TR8" specifies 8 mm tape-and-reel packaging per EIA-296.
Can the 1N4748CP/TR8 be used in surface-mount designs?
No - the 1N4748CP/TR8 uses a DO-41 axial-lead package and is designed for through-hole mounting. For surface-mount equivalents, consider Microsemi's MLL4748A (SOD-80) or ON Semiconductor's 1SMA4748A (SMA), both rated for 1 W but requiring PCB layout changes and requalification.
What is the maximum steady-state current the 1N4748CP/TR8 can handle at room temperature?
At ambient temperature ≤45°C on an FR4 board with 4 mm² copper pads, the 1N4748CP/TR8 supports up to 205 mA steady-state regulator current (IZM). This value decreases with rising ambient temperature per the derating curve in Figure 1 of the Microsemi datasheet for 1N4748CP/TR8.
Does the 1N4748CP/TR8 require moisture preconditioning before reflow soldering?
No - the 1N4748CP/TR8 is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ≤30°C/60% RH without dry packing or baking. This simplifies handling and eliminates pre-reflow bake steps in manufacturing.
How does the thermal resistance of the 1N4748CP/TR8 compare between lead and ambient mounting conditions?
The 1N4748CP/TR8 has 45°C/W junction-to-lead thermal resistance at 10 mm lead length, but 105°C/W junction-to-ambient when mounted on FR4 with standard 1 oz copper. This 2.3× difference highlights why heatsinking via leads is essential for sustained 1 W operation - board layout must prioritize short, wide traces to the cathode/anode pads to minimize ambient resistance.
1N4748CP/TR8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4748CP/TR8 FAQ
1.How can I place an order for 1N4748CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4748CP/TR8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N4748CP/TR8 reliable?
The price and inventory of 1N4748CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4748CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4748CP/TR8?
1N4748CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4748CP/TR8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N4748CP/TR8?
For technical support, including 1N4748CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748CP/TR8 requirements.
6.How does Aetrix verify that 1N4748CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4748CP/TR8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N4748CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4748CP/TR8?
All 1N4748CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748CP/TR8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N4748CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4748CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4748CP/TR8 Tags
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